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Role of surface finishing on the in vitro biological properties of a silicon nitride–titanium nitride (Si3N4–TiN) composite

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Abstract

Silicon nitride (Si3N4) has been introduced clinically as an orthopedic biomaterial for interbody fusion devices and in joint replacements. However, the production of complex shapes through conventional mechanical machining is difficult and expensive and limits interesting applications. Thus, several electrically conductive reinforcements to the Si3N4 matrix, like TiN, have been proposed, generating composites suitable to be wrought by electrical discharge machining (EDM). In this study, Si3N4–TiN with high strength, low density, and good electric conductivity wrought by EDM was studied. The role of surface finishing was investigated comparing the interface generated during the EDM process to that resulting from further polishing. The different topographical features were assessed by electron microscopy, energy dispersive X-ray spectrometry, and profilometry. Surface wettability was also determined based on the measurement of the OCA of water and diiodomethane. The biological responses induced in MC3T3 cells, a widely diffused osteoblast model, were correlated with the surface pattern. The unpolished samples could promote better cell viability, with a more relevant effect on the cytoskeleton arrangement as highlighted by numerous cytoplasmic extensions and filopodia-like structures and the high number of focal adhesions, while MC3T3 cells grown on polished Si3N4–TiN specimens displayed a flat morphology. In addition, the unpolished Si3N4–TiN increased osteocalcin production and calcium deposition. Taken together, these data support the biocompatibility and in vitro osteogenic properties of the electroconductive Si3N4–TiN investigated. Further in vivo studies are required to explore the possible use of bone implants directly obtained by EDM.

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Author notes

    Authors and Affiliations

    1. Department of Surgical Sciences UNITO, CIR Dental School, via Nizza 230, 10126, Turin, Italy

      F. Mussano, T. Genova & S. Carossa

    2. Department of Life Sciences and Systems Biology, UNITO, via Accademia Albertina 13, 10123, Turin, Italy

      T. Genova & L. Munaron

    3. Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Turin, Italy

      P. Rivolo & P. Mandracci

    4. Centre for Nanostructured Interfaces and Surfaces (NIS), Turin, Italy

      L. Munaron

    5. IMAMOTER-National Council of Research, Strada delle Cacce 73, 10135, Turin, Italy

      M. G. Faga

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    1. F. Mussano
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    Correspondence to F. Mussano.

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    F. Mussano and T. Genova contributed equally to the paper.

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    Mussano, F., Genova, T., Rivolo, P. et al. Role of surface finishing on the in vitro biological properties of a silicon nitride–titanium nitride (Si3N4–TiN) composite. J Mater Sci 52, 467–477 (2017). https://doi.org/10.1007/s10853-016-0346-1

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    • DOI: https://doi.org/10.1007/s10853-016-0346-1

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